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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4802 Advisory (icsa-22-270-01) Hitachi Energy AFS660/AFS665 28 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Hitachi Energy AFS660/AFS665 Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2020-6994 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-270-01 Comment: CVSS (Max): 9.8 CVE-2020-6994 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-270-01) Hitachi Energy AFS660/AFS665 Original release date: September 27, 2022 Legal Notice All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 9.8 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Hitachi Energy o Equipment: AFS660/AFS665 o Vulnerability: Improper Input Validation 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to overflow an internal buffer and fully compromise the target device. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Hitachi Energy reports this vulnerability affects the following AFS660/AFS665 industrial switches: o Releases 7.0.02 or prior 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER INPUT VALIDATION CWE-20 Improper parsing of URL arguments could allow an attacker to exploit this vulnerability by crafting specially formed HTTP requests to overflow an internal buffer. Successful exploitation could fully compromise the device. CVE-2020-6994 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Energy o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Switzerland 3.4 RESEARCHER Hitachi Energy reported this vulnerability to CISA. 4. MITIGATIONS Hitachi Energy recommends users update to 7.1.05 or later or apply mitigation strategies. Hitachi Energy recommends the following security practices and firewall configurations to protect process control networks from attacks originating from outside the network: o Physically protect process control systems from unauthorized direct access. o Separate process control systems from the internet and other networks using a firewall system with minimal open ports. o Process control systems should not be used for internet surfing, instant messaging, or email. o Portable computers and removable storage media should be carefully scanned for viruses before connecting to a control system. For more information, see Hitachi Energy advisory 8DBD000122. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage at cisa.gov/ics . Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies . Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. This vulnerability is exploitable remotely. This vulnerability has a low attack complexity. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYzPCKskNZI30y1K9AQhtZxAAtHZpngY8N8rWrC3eIF40AoCuARYg85AY QZQrT+EJ7Mv7b9YVf6Jjz4h6cOTp49D9w9SS4BLRJKbp8KUyeDDaDYa9eRptQigU y8OTfbdvCOgUFqCd3bmGfw6WDGPPsgp3Hujx5VxO41Jbg5EE3K9Prg1f04T/xi9E L505Q6Jyx57GrUtJarCSy9WVO9QwMB+MdvtKdPkymptT+s9a4v27sYVR8FintON+ ztEYswpberr/ZvXZDa7gRbfW4aw1LwIV4wdPllNC+ebMxB7cogAi23lMoLtK1b8m o1sE8kr3MvX/duaqDtC0fag0yaat+AbIaj4W9DVsuJkosvrgKWdWtz15qRpRaCio p8yOOcc1gMdVkFZmjEinW/BbzwvtAL2AEvmQv59XWwWN+tHfnnE2TTPddHCkms6g A7LWhpfNBmhADJioYs+DIHtTBbd7tugougxClqSQuyQ1PHRhGj3Eh7a6UN7YXV0D N7NnxuUMS79GI73Tr3WZCMSo7umEa/ZreyCD5HmgzuvO0pDikXqQgKes7UlEcpxe ROPD6tNqnlugcNyPZmQcwyPTSDjh1HvEEOT2EAEwUUYvNCfQ8z+w8AREmr02yIvh KIjzE8AiuGEYqVsnrRjUOsQx1YbC3bV4q8I0ykJraSL4sktVdb39Mtb5rtYjMiZv venY/Y1wJZs= =o8cH -----END PGP SIGNATURE-----